slow pitch strike zone

[rharrell]

New to slow pitch this year after years of coaching and calling fast pitch and baseball.

While I base my zone on the batter, player's seem to have the mentality that there is a box behind the plate and if the ball lands in that box it's a strike. I've seen some umpires in our league point to the ground and call "deep" which seems to reinforce this. Had a game last weekend with a couple of 6.5 foot players and some who were barely 5 foot and this led to more than the usual whining about the zone. Also, we normally play with a 4' 10' arc, but it was 6' 12' for this particular tournament.

I'm sticking to calling it either a ball or a strike without explanation. I'm sure this has probably been discussed before, but any advice on maintaining a consistent slow pitch strike zone?